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I get a reading of about 98 volts through the flyback when disconnecting the plate cap from the 6KD6 and connecting the meter to the plate cap lead...usually I get the full B+ voltage here so there may be a flyback problem. I disconnected the plate cap from the HV rectfier tube with no change. I'll try laying the neon lamp against the HV lead to see if HV AC is being developed but I don't think any is.
Here's the strange thing...when an external power supply is connected to the 6KD6 screen (orginal connection broken) and the voltage is set to 145 volts, and the set is off, there is no current draw from the external supply. Then when the set is plugged in (with the 6KD6 plate cap disconnected) the screen current begins to increase as the tube warms up and keeps going past 150 ma. Normal screen current draw is only 20 ma.
If the cathode lead is disconnected from the 6KD6, the screen current draw is then zero.
It is like there is something going on in the screen to cathode or screen to grid circuit that is causing an overload as the tube warms up. This is not related to the flyback because it occurs when the plate lead is disconnected from the 6KD6. Thanks for your suggestions, I will look at it a little some more tonight.
Carmine, the original tail light probably got broken by vandals at the car lot where I bought the Grand Marquis. It just has a small hole in it but they would not allow a repair to pass a state inspection, the inspector said it needed a new intact taillight. If you ever come across one though let me know. Most junkyards seem to have sent this age car to the car crusher already so they seem very rare.
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